Expansion screw



FIG. 1 is a top perspective view of the expansion screw, showing our newdesign;

FIG. 2 is a bottom perspective view thereof.

FIG. 3 is a front elevational thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a left side elevational view thereof;

FIG. 6 is a right side elevational view thereof;

FIG. 7 is a top plan view thereof; and,

FIG. 8 is a bottom plan view thereof.

The broken lines in the drawings illustrate portions of the expansionscrew and form no part of the claimed design.

CLAIM The ornamental design for an expansion screw, as shown anddescribed.